Printing fine metal grid touch control capacitance switch and production method thereof
By using the fine printed metal mesh structure and OCA glue layer design in the touch switch, the existing touch switches are solved, and the problems of inability to bend, short life and uneconomical preparation are achieved, achieving a wider application scenario and a more efficient environmentally friendly preparation process.
Patent Information
- Application Number
- CN202510192094.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-06-10
AI Technical Summary
The existing touch switches cannot be bent, have short life, limited use scenarios, and are not environmentally friendly in the preparation process.
The printed fine metal mesh touch capacitor switch is adopted, including the PET substrate layer, the touch circuit layer, the carbon wire layer, the jumper insulation layer, the silver paste jumper layer and the insulation layer. The silver wire is arranged as a grid and bonded to the panel through the OCA glue layer to avoid wet process.
The bending capability of the switch is achieved, the service life is extended, the use scenarios are expanded, and the preparation process is more environmentally friendly and the cost is reduced by 40%.
Smart Images
Figure CN120128154A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of touch switches, and particularly to a printed fine metal grid touch capacitive switch and a production method thereof. Background Art
[0002] At present, the function on-off keys of automobiles, household appliances, and some industrial electronics mainly adopt mechanical buttons and ITO coating on glass substrates. The former is the most primitive design. From an application perspective, mechanical buttons may cause functional out-of-control due to an increase in the number of uses. The latter method of ITO coating (touch) on glass substrates has high costs, requires sputtering and etching (the process uses chemical potions and is not environmentally friendly), and at the same time, the product has a relatively thick thickness, with the thinnest thickness of 0.5 mm and is not bendable. The lifespan of mechanical buttons is unreliable, and the application space and scenarios of glass ITO substrates are limited.
[0003] In view of this, it is necessary to provide a printed fine metal grid touch capacitive switch and a production method thereof. Summary of the Invention
[0004] The printed fine metal grid touch capacitive switch and the production method thereof provided by the present invention effectively solve the problems of the existing touch switches that cannot be bent, have a short lifespan, limited usage scenarios, and an environmentally unfriendly preparation process.
[0005] The technical solution adopted by the present invention is as follows:
[0006] A printed fine metal grid touch capacitive switch includes an adhesive layer, a touch capacitive switch layer disposed on the upper end surface of the adhesive layer, a bonding layer disposed on the upper end surface of the touch capacitive switch layer, and a panel disposed on the upper end surface of the bonding layer; the touch capacitive switch layer includes a PET substrate layer, a touch circuit layer, a carbon wire layer, a jumper insulating layer, a silver paste jumper layer, and an insulating layer sequentially arranged from top to bottom. The touch circuit layer includes a touch PAD disposed on the PET substrate layer and silver wires electrically connected to the touch PAD. The jumper insulating layer is provided with through holes, and the silver paste jumper layer passes through the through holes and is electrically connected to the silver wires. The silver wires are arranged in a grid.
[0007] Further: the grid is a honeycomb grid or an oblique grid.
[0008] Further: the silver wire spacing of the grid is greater than 200 um.
[0009] Further: a white reinforcing sheet is further disposed on the upper end surface of the PET substrate layer.
[0010] Further: a transparent protective film is further disposed on the upper end surface of the white reinforcing sheet.
[0011] Further: The touch capacitive switch layer includes a body layer and a connection end protruding from one end of the body layer, and the back glue layer, the adhesive layer, and the panel all correspond to the body layer.
[0012] Further: The adhesive layer is an OCA glue layer.
[0013] Further: The panel is used to identify the function description.
[0014] A production method for preparing the printed fine metal grid touch capacitive switch includes the following steps: S1, preparing the touch capacitive switch layer; S2, setting an adhesive layer on the upper end face of the touch capacitive switch layer and setting a back glue layer on the lower end face of the touch capacitive switch layer; S3, laminating the panel on the adhesive layer; Step S1 includes S101, shrinking the PET substrate layer; S102, printing a touch circuit layer on the lower end face of the PET substrate layer; S103, printing a carbon wire layer on the touch circuit layer; S104, printing a jumper insulation layer on the carbon wire layer; S105, printing an insulation layer on the jumper insulation layer.
[0015] Further: Step S1 further includes S106, attaching a white reinforcement sheet on the upper end face of the PET substrate layer; S107, setting a transparent protective film on the white reinforcement sheet.
[0016] Advantages of the invention:
[0017] 1. The entire printed fine metal grid touch capacitive switch can be bent and can be applied to a variety of different scenarios.
[0018] 2. The preparation of the entire printed fine metal grid touch capacitive switch does not require a wet process, so there is no need to use chemicals for etching, and the preparation process can be made more environmentally friendly.
[0019] 3. Compared with the traditional preparation process, the entire preparation process saves 40% of the steps and effectively saves costs.
[0020] 4. The weight of the entire printed fine metal grid touch capacitive switch is effectively reduced, realizing the thinning and lightening of the product. Description of the drawings
[0021] Figure 1 It is an exploded view of the printed fine metal grid touch capacitive switch provided by the embodiment of the present application.
[0022] Figure 2 It is an exploded view of the touch capacitive switch layer of the printed fine metal grid touch capacitive switch provided by the embodiment of the present application.
[0023] Figure 3 It is a schematic diagram of the printed fine metal grid touch capacitive switch provided by the embodiment of the present application.
[0024] The markings in the figure are: 1, the adhesive layer; 2, the touch capacitive switch layer; 3, the bonding layer; 4, the panel; 21, the PET substrate layer; 22, the touch circuit layer; 23, the carbon wire layer; 24, the jumper insulation layer; 25, the silver paste jumper layer; 26, the insulation layer; 27, the white reinforcement sheet; 28, the transparent protective film; 201, the body layer; 202, the connection end. Specific Embodiments
[0025] To make the above objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0026] As Figure 1 and Figure 2 shown, the first embodiment provided by the present application is a printed fine metal grid touch capacitive switch, including an adhesive layer 1, a touch capacitive switch layer 2 disposed on the upper end surface of the adhesive layer 1, a bonding layer 3 disposed on the upper end surface of the touch capacitive switch layer 2, and a panel 4 disposed on the upper end surface of the bonding layer 3; the touch capacitive switch layer 2 includes a PET substrate layer 21, a touch circuit layer 22, a carbon wire layer 23, a jumper insulation layer 24, a silver paste jumper layer 25, and an insulation layer 26 sequentially arranged from top to bottom. The touch circuit layer 22 includes a touch PAD disposed on the PET substrate layer 21 and silver wires electrically connected to the touch PAD. The jumper insulation layer 24 is provided with through holes, and the silver paste jumper layer 25 passes through the through holes and is electrically connected to the silver wires. The silver wires are arranged in a grid.
[0027] The carbon wire layer 23 is used to protect the silver wires and prevent the silver wires from being exposed and oxidized. An anti-interference protection circuit is formed through the silver paste jumper layer 25 and the peripheral ground wire. The PET substrate layer 21 serves as a support. When a finger touches, the signal is transmitted to the MCU through the touch circuit layer. The jumper insulation layer 24 can insulate and shield the jumper layer 23, and the insulation layer 26 can insulate and shield the lower end surface of the entire touch capacitive switch layer 2.
[0028] As Figure 3 shown, during actual use, A1 and A2 are the connection ports of the touch capacitive switch. The touch area of the MCU control board product connected to the host is regarded as an equivalent capacitor. When a finger touches the insulation layer 26 in the B1 and B2 areas, the capacitance of the equivalent capacitor is changed due to the static electricity of the human body, thereby triggering the MCU to work. The function of the C area is similar, and the design structure is a touch method of a slide resistor.
[0029] In the above design, PET is used as the base layer, and the thickness of the PET base layer 21 can be made 0.1 mm. It can achieve more than 100 bends of the PET base layer 21 under the condition that the folding R angle is 0 degrees, enabling it to be applied in different scenarios, such as the comfort system of automobiles, window lifting, rearview mirror folding, various function switches of household appliances, and function switches of some industrial electronics. At the same time, the printing additive manufacturing method is adopted to avoid the wet chemical process, which is more environmentally friendly. The entire product can achieve a 3D touch form.
[0030] Specifically: The grid is a honeycomb grid or an oblique grid.
[0031] In the above design, by setting the grid as a honeycomb grid or an oblique grid, an electric field can be formed by arranging silver wires.
[0032] Specifically: The silver wire spacing of the grid is greater than 200 um.
[0033] In the above design, a silver wire spacing of the grid greater than 200 um is convenient for wiring.
[0034] Specifically: As Figure 2 shown, a white reinforcing sheet 27 is further provided on the upper end surface of the PET base layer 21.
[0035] In the above design, the transparency can be enhanced through the white reinforcing sheet 27.
[0036] Specifically: As Figure 2 shown, a transparent protective film 28 is further provided on the upper end surface of the white reinforcing sheet 27.
[0037] In the above design, setting the transparent protective film 28 can not only achieve a transparent effect but also effectively protect the touch capacitive switch layer 2.
[0038] Specifically: As Figure 1 shown, the touch capacitive switch layer 2 includes a body layer 201 and a connection end 202 protruding from one end of the body layer 201, and the adhesive layer 1, the bonding layer 3, and the panel 4 all correspond to the body layer 201.
[0039] In the above design, by connecting the connection end 202 to the MCU of the host and fixing the panel 4 through the bonding layer 3, the body layer 201 can be protected, and since the bonding layer 3 corresponds to the body layer 201, the body layer 201, the bonding layer 3, and the panel 4 can be deformed synchronously.
[0040] Specifically: The bonding layer 3 is an OCA adhesive layer.
[0041] In the above design, the OCA adhesive is a special optically transparent double-sided adhesive, mainly used in the display and touch field as an adhesive between different components. Its structure is divided into three layers. The middle is a substrate-free optically acrylic pressure-sensitive adhesive, and the upper and lower layers are optically release films. In this application, the OCA adhesive is used to bond the panel 4 and the touch capacitive switch layer 2, which can not only connect the touch capacitive switch layer 2 and the panel 4, but also ensure that the display effect is not affected, maintain the transparency and brightness of the screen, still maintain performance in a humid environment, can work stably in a high-temperature environment, extend the service life, and prevent yellowing.
[0042] Specifically: The panel 4 is used to identify the function description.
[0043] In the above design, the functions of the entire touch capacitive switch are marked on the panel 4, which is convenient for operators to understand.
[0044] The second embodiment provided by this application is a production method for preparing the printed fine metal grid touch capacitive switch, including the following steps: S1. Prepare the touch capacitive switch layer 2; S2. Set the bonding layer 3 on the upper end face of the touch capacitive switch layer 2, and set the back glue layer 1 on the lower end face of the touch capacitive switch layer 2; S3. Bond the panel 4 on the bonding layer 3; Step S1 includes S101. Shrink the PET substrate layer 21; S102. Print the touch circuit layer 22 on the lower end face of the PET substrate layer 21; S103. Print the carbon wire layer 23 on the touch circuit layer 22; S104. Print the jumper insulation layer 24 on the carbon wire layer 23; S105. Print the insulation layer 26 on the jumper insulation layer 24.
[0045] In the above design, it can effectively realize the manufacture of the printed fine metal grid touch capacitive switch. It avoids the wet chemical process of the potion, making the preparation process more environmentally friendly. It saves the steps of the preparation process, and the manufacturing cost is reduced by more than 40% compared with the traditional process, making it more competitive.
[0046] Specifically: Step S1 further includes S106. Attach a white reinforcement sheet 27 to the upper end face of the PET substrate layer 21; S107. Set a transparent protective film 28 on the white reinforcement sheet 27.
[0047] In the above design, the white reinforcement sheet 27 can cooperate with the transparent protective film 28 to improve the transparency effect.
[0048] The third embodiment provided by this application is a printed fine metal grid touch capacitive switch, which includes an adhesive layer 1, a touch capacitive switch layer 2 disposed on the upper end surface of the adhesive layer 1, an adhesive layer 3 disposed on the upper end surface of the touch capacitive switch layer 2, and a panel 4 disposed on the upper end surface of the adhesive layer 3; the touch capacitive switch layer 2 includes a PET substrate layer 21, a touch circuit layer 22, a carbon wire layer 23, a jumper insulating layer 24, a silver paste jumper layer 25, and an insulating layer 26 which are sequentially disposed from top to bottom. The touch circuit layer 22 includes a touch PAD disposed on the PET substrate layer 21 and silver wires electrically connected to the touch PAD. The jumper insulating layer 24 is provided with through holes, and the silver paste jumper layer 25 passes through the through holes and is electrically connected to the silver wires. The silver wires are arranged in a grid. The grid is a honeycomb grid or an oblique grid. The pitch of the silver wires in the grid is greater than 200 um. A white reinforcing sheet 27 is further disposed on the upper end surface of the PET substrate layer 21. A transparent protective film 28 is further disposed on the upper end surface of the white reinforcing sheet 27. The touch capacitive switch layer 2 includes a body layer 201 and a connection end 202 protruding from one end of the body layer 201. The adhesive layer 1, the adhesive layer 3, and the panel 4 all correspond to the body layer 201. The adhesive layer 3 is an OCA adhesive layer. The panel 4 is used to label function descriptions.
[0049] In the above design, by using PET as the substrate layer, the thickness of the PET substrate layer 21 can be made 0.1 mm, enabling the bending of the PET substrate layer 21, so that it can be applied to different scenarios, such as various function switches in automotive comfort systems, window lifters, rearview mirror folding, household appliances, and some industrial electronics. At the same time, the printing additive manufacturing method is adopted to avoid the wet chemical process, which is more environmentally friendly. The entire product can achieve a 3D touch form. Setting the grid as a honeycomb grid or an oblique grid can form an electric field by arranging the silver wires. A grid silver wire pitch greater than 200 um is convenient for wiring. The transparency can be enhanced through the white reinforcing sheet 27. Setting the transparent protective film 28 can not only achieve a transparent effect but also effectively protect the touch capacitive switch layer 2. It is connected to the MCU of the host through the connection end 202, and the panel 4 is fixed through the adhesive layer 3, which can protect the body layer 201. And since the adhesive layer 3 corresponds to the body layer 201, the body layer 201, the adhesive layer 3, and the panel 4 can deform synchronously. In this application, OCA glue is used to bond the panel 4 and the touch capacitive switch layer 2, which can not only connect the touch capacitive switch layer 2 and the panel 4 but also ensure that the display effect is not affected, maintain the transparency and brightness of the screen, still maintain performance in a humid environment, can work stably in a high-temperature environment, extend the service life, and prevent yellowing.
[0050] For further details, it should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A printed fine metal grid touch capacitive switch, characterized in that: The invention comprises a back glue layer (1), a touch capacitor switch layer (2) arranged on the upper end surface of the back glue layer (1), an adhesive layer (3) arranged on the upper end surface of the touch capacitor switch layer (2), and a panel (4) arranged on the upper end surface of the adhesive layer (3); the touch capacitor switch layer (2) comprises a PET substrate layer (21), a touch circuit layer (22), a carbon wire layer (23), a jumper insulating layer (24), a silver paste jumper layer (25), and an insulating layer (26) arranged in sequence from top to bottom; the touch circuit layer (22) comprises a touch PAD arranged on the PET substrate layer (21) and a silver wire connected to the touch PAD; the jumper insulating layer (24) is provided with a through hole; the silver paste jumper layer (25) passes through the through hole and is connected to the silver wire; the silver wire is arranged in a grid.
2. The printed fine metal grid touch capacitive switch according to claim 1, characterized in that: The grid is a honeycomb grid or an oblique grid.
3. The printed fine metal grid touch capacitive switch according to claim 1, characterized in that: The silver wire spacing of the grid is greater than 200 um.
4. The printed fine metal grid touch capacitive switch according to claim 1, characterized in that: A white reinforcing sheet (27) is also provided on the upper end surface of the PET substrate layer (21).
5. The printed fine metal grid touch capacitive switch according to claim 4, characterized in that: The upper end surface of the white reinforcing sheet (27) is also provided with a transparent protective film (28).
6. The printed fine metal grid touch capacitive switch according to claim 1, characterized in that: The touch capacitance switch layer (2) comprises a main body layer (201) and a connection end (202) protruding from one end of the main body layer (201), and the back glue layer (1), the adhesive layer (3) and the panel (4) all correspond to the main body layer (201).
7. The printed fine metal grid touch capacitive switch according to claim 1, characterized in that: The adhesive layer (3) is an OCA adhesive layer.
8. The printed fine metal grid touch capacitive switch according to claim 1, characterized in that: The panel (4) is used to identify the function description.
9. A production method for preparing the printed fine metal grid touch capacitive switch according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: S1, preparing a touch capacitor switch layer (2); S2, arranging an adhesive layer (3) on the upper end surface of the touch capacitor switch layer (2), and arranging a backing glue layer (1) on the lower end surface of the touch capacitor switch layer (2); S3, laminating a panel (4) on the adhesive layer (3); step S1 comprises S101, shrinking a PET substrate layer (21); S102, printing a touch circuit layer (22) on the lower end surface of the PET substrate layer (21); S103, printing a carbon line layer (23) on the touch circuit layer (22); S104, printing a jumper insulating layer (24) on the carbon line layer (23); and S105, printing an insulating layer (26) on the jumper insulating layer (24).
10. The production method according to claim 9, characterized in that: The step S1 further comprises S106, attaching a white reinforcing sheet (27) to the upper end surface of the PET substrate layer (21); and S107, providing a transparent protective film (28) on the white reinforcing sheet (27).